Role

Detective

Investigates crimes, gathers evidence, and works cases through to charge.

11 chaptersAbout 2–4 months15–30 min a day12 skills1 projects
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Chapter 1 is free. No card needed.

Day 1 on the Detective path.

What a Detective does

Investigates serious crimes by gathering and analysing evidence, interviewing witnesses and suspects, and building a case strong enough to charge someone and stand up in court. Detectives are usually sworn officers, but entry routes, ranks, and what counts as a detective vary by country: many forces promote from patrol, while the UK also offers a direct-entry detective constable route, and some forces require a degree where others ask for none.

  • Investigate assigned crimes by following leads and confirming facts
  • Visit scenes, secure evidence, and direct technical teams there
  • Interview witnesses, victims, and suspects to build the story
  • Analyse phone, financial, and forensic records for useful links
  • Build a case file the prosecutor can take to court
  • Track and arrest suspects with patrol and other units
  • Write detailed reports and keep an unbroken chain of custody
  • Brief senior officers and coordinate with partner agencies

A day in the life

  1. Start with a caseload review and overnight updates from patrol
  2. Visit a scene or follow up leads from yesterday's interviews
  3. Interview a witness, then question a suspect under caution
  4. Chase forensic, phone, and bank records and log every step
  5. Update the case file, then brief a supervisor on next moves

Tools you will use

Case management: investigation databases, evidence logsRecords: criminal records, phone and financial data systemsForensics: fingerprint and DNA matching tools, lab requestsSurveillance: cameras, tracking equipment, recorded interviewsDocumentation: statements, warrants, court file softwareCommunication: radios, secure messaging, agency networks

Your plan

Chapter by chapter.

1~1 wk

See detective work up close

StartFree
21–2 wks

Case and Evidence Management

Skills
31–2 wks

Investigation case study: build a case file from a solved crime

Proof
41–2 wks

Interviews and Communication

Skills
51–2 wks

Reasoning and Situational Awareness

Skills
6~1 wk

Meet working detectives

People
71–2 wks

Law, Ethics, and Authority

Skills
81–2 wks

People and Personal Resilience

Skills
91–2 wks

Choose your detective route

Decide
101–2 wks

Prepare for detective interviews

Interview
11on your timeline

Apply for detective roles

Apply

By the last chapter

This is what you can show.

Things you've made

Investigation case study: build a case file from a solved crime

Skills you can prove

12 skills, each rated on work you actually did.

People you've talked to

3 people who do the job, with a message ready for each.

Questions you can answer

17 interview questions and a mock interview, with feedback.

Credentials

6 credentials compared, so you can pick one, or decide you don't need one. None is required.

Ways in

There is more than one route.

Ways to study

  • Police academy training, then promotion from patrol to detective
  • Bachelor degree in criminology, criminal justice, or law (required by some forces, optional in others)
  • Degree in psychology or sociology to read people and behaviour
  • Degree in political science or public administration for policy-heavy roles
  • Direct-entry detective programme (for example the UK detective constable route) with on-the-job training
  • Vocational diploma in criminal investigation plus accredited detective training

How people get their first job

  • Join as a patrol officer first, then apply for the detective track (common in the US and Canada)
  • Apply to a direct-entry detective constable scheme where offered (for example in the UK)
  • Take courses in criminology, law, and forensic basics while at school
  • Build interviewing and writing skills through debate, journalism, or volunteer work
  • Pass the fitness, background, and scenario-based tests every force requires
  • Start in a police support or crime analyst role to learn how cases work

Life skills on this path: Networking · Job interviews · Job search

How the work is changing

What AI is doing to this role

How AI is changing this role · one of 6 tasks we track

Analyze phone, financial, and forensic records

Sped up a lot

What AI does

AI sorts phone dumps and bank data in minutes, not days.

Still yours

You pick which link matters and which is nothing.

Reviewed September 2026

In the app · Premium

The rest is in the app

  • How AI affects the other 5 tasks
  • Whether this job is growing or shrinking
  • How hard the first job is to get
  • Similar roles that are easier to get into
  • Updated every month, with sources
See it in the app →

How we rate a job →

Already working

Already a Detective?

Plan your move to Detective Sergeant: 10 chapters that end with a strong case for your next review.

Grow in the role →

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Questions

Questions about this path

How long does it take to become a detective with Welica?

The path is 11 chapters, 2–4 months at 15 to 30 minutes a day. You can go faster or slower; the plan moves with you.

Do I need a degree?

Not always. Common routes are police academy training, then promotion from patrol to detective, bachelor degree in criminology, criminal justice, or law (required by some forces, optional in others), degree in psychology or sociology to read people and behaviour, degree in political science or public administration for policy-heavy roles, direct-entry detective programme (for example the UK detective constable route) with on-the-job training, or vocational diploma in criminal investigation plus accredited detective training.

What is free?

Chapter 1, See detective work up close, is free for good. Premium unlocks the rest of the path.

Start the Detective path.

Chapter 1 free. About 15 to 30 minutes a day.

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